diff --git a/lib/appdata.dart b/lib/appdata.dart
index 4b1bf0a..90243da 100644
--- a/lib/appdata.dart
+++ b/lib/appdata.dart
@@ -3,6 +3,7 @@ import 'dart:io';
 
 import 'package:flutter/services.dart';
 import 'package:path_provider/path_provider.dart';
+import 'package:pixes/utils/io.dart';
 
 import 'foundation/app.dart';
 import 'network/models.dart';
@@ -43,12 +44,13 @@ class _Appdata {
     }
   }
 
-  String get downloadPath => settings["downloadPath"];
-
   Future<String> get _defaultDownloadPath async{
     if(App.isAndroid) {
-      var externalStoragePaths = await getExternalStorageDirectories(type: StorageDirectory.downloads);
-      var res = externalStoragePaths?.first.path;
+      String? downloadPath = "/storage/emulated/0/download";
+      if (!Directory(downloadPath).havePermission()) {
+        downloadPath = null;
+      }
+      var res = downloadPath;
       res ??= (await getExternalStorageDirectory())!.path;
       return "$res/pixes";
     } else if (App.isWindows){
@@ -58,7 +60,7 @@ class _Appdata {
       }
     } else if (App.isMacOS || App.isLinux) {
       var downloadPath = (await getDownloadsDirectory())?.path;
-      if(downloadPath != null) {
+      if(downloadPath != null && Directory(downloadPath).havePermission()) {
         return "$downloadPath/pixes";
       }
     }
diff --git a/lib/network/download.dart b/lib/network/download.dart
index ea4314e..e9fe25c 100644
--- a/lib/network/download.dart
+++ b/lib/network/download.dart
@@ -113,18 +113,19 @@ class DownloadingTask {
 
   static String _generateFilePath(Illust illust, int index, String ext) {
     final String downloadPath = appdata.settings["downloadPath"];
-    final String subPathPatten = appdata.settings["downloadSubPath"];
+    String subPathPatten = appdata.settings["downloadSubPath"];
     final tags = appdata.settings["useTranslatedNameForDownload"] == false
         ? illust.tags.map((e) => e.name).toList()
         : illust.tags.map((e) => e.translatedName ?? e.name).toList();
     final tagsWeight = (appdata.settings["tagsWeight"] as String).split(' ');
     tags.sort((a, b) => tagsWeight.indexOf(a) - tagsWeight.indexOf(b));
-    subPathPatten.replaceAll(r"${id}", illust.id.toString());
-    subPathPatten.replaceAll(r"${title}", illust.title);
-    subPathPatten.replaceAll(r"${author}", illust.author.name);
-    subPathPatten.replaceAll(r"${ext}", ext);
+    subPathPatten = subPathPatten.replaceAll(r"${id}", illust.id.toString());
+    subPathPatten = subPathPatten.replaceAll(r"${title}", illust.title);
+    subPathPatten = subPathPatten.replaceAll(r"${author}", illust.author.name);
+    subPathPatten = subPathPatten.replaceAll(r"${index}", index.toString());
+    subPathPatten = subPathPatten.replaceAll(r"${ext}", ext);
     for(int i=0; i<tags.length; i++) {
-      subPathPatten.replaceAll("\${tag$i}", tags[i]);
+      subPathPatten = subPathPatten.replaceAll("\${tag$i}", tags[i]);
     }
     return "$downloadPath$subPathPatten";
   }
@@ -203,7 +204,7 @@ class DownloadManager {
     var res = _db.select('''
       select * from images
       where illust_id = ? and image_index = ?;
-    ''');
+    ''', [illustId, index]);
     if (res.isEmpty) return null;
     var file = File(res.first["path"] as String);
     if (!file.existsSync()) return null;
diff --git a/lib/pages/illust_page.dart b/lib/pages/illust_page.dart
index 38773fc..3bbb135 100644
--- a/lib/pages/illust_page.dart
+++ b/lib/pages/illust_page.dart
@@ -74,11 +74,6 @@ class _IllustPageState extends State<IllustPage> {
   }
 
   Widget buildImage(double width, double height, int index) {
-    File? downloadFile;
-    if(widget.illust.downloaded) {
-      downloadFile = DownloadManager().getImage(widget.illust.id, index);
-    }
-
     if (index == 0) {
       return Text(
         widget.illust.title,
@@ -86,6 +81,10 @@ class _IllustPageState extends State<IllustPage> {
       ).paddingVertical(8).paddingHorizontal(12);
     }
     index--;
+    File? downloadFile;
+    if(widget.illust.downloaded) {
+      downloadFile = DownloadManager().getImage(widget.illust.id, index);
+    }
     if (index == widget.illust.images.length) {
       return const SizedBox(
         height: _kBottomBarHeight,
@@ -107,6 +106,7 @@ class _IllustPageState extends State<IllustPage> {
             ? widget.illust.images[index].original
             : "file://${downloadFile.path}"),
         child: Image(
+          key: ValueKey(index),
           image: downloadFile == null
             ? CachedImageProvider(widget.illust.images[index].large) as ImageProvider
             : FileImage(downloadFile) as ImageProvider,
diff --git a/lib/pages/image_page.dart b/lib/pages/image_page.dart
index 86b8238..71aea2f 100644
--- a/lib/pages/image_page.dart
+++ b/lib/pages/image_page.dart
@@ -53,9 +53,9 @@ class _ImagePageState extends State<ImagePage> with WindowListener{
 
   @override
   Widget build(BuildContext context) {
-    return ColoredBox(
-      color: FluentTheme.of(context).micaBackgroundColor.withOpacity(1),
-      child: Stack(
+    return ScaffoldPage(
+      padding: EdgeInsets.only(top: MediaQuery.of(context).padding.top),
+      content: Stack(
         children: [
           Positioned.fill(child: PhotoView(
             backgroundDecoration: const BoxDecoration(
@@ -82,7 +82,8 @@ class _ImagePageState extends State<ImagePage> with WindowListener{
                   const Expanded(
                     child: DragToMoveArea(child: SizedBox.expand(),),
                   ),
-                  WindowButtons(key: ValueKey(windowButtonKey),),
+                  if(App.isDesktop)
+                    WindowButtons(key: ValueKey(windowButtonKey),),
                 ],
               ),
             ),
diff --git a/lib/utils/io.dart b/lib/utils/io.dart
index ca097e7..89e747c 100644
--- a/lib/utils/io.dart
+++ b/lib/utils/io.dart
@@ -21,6 +21,18 @@ extension FSExt on FileSystemEntity {
   }
 }
 
+extension DirectoryExt on Directory {
+  bool havePermission() {
+    if(!existsSync()) return false;
+    try {
+      listSync();
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+}
+
 String bytesToText(int bytes) {
   if(bytes < 1024) {
     return "$bytes B";